WAGO 750 Series Manual page 143

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Additional network classes (D, E) are only used for special tasks.
More information
A more detailed description of these principles is found on the Internet under
http://www.WuT.de/us_printmed.html (W&T, Manual TCP/IP-ETHERNET for
Beginners).
Key data
Class A
Class B
Class C
Each WAGO ETHERNET fieldbus coupler/controller can be easily assigned
an IP address via the implemented BootP protocol. For small internal
networks we recommend selecting a network address from Class C.
Attention
Never set all bits to equal 0 or 1 in one byte (byte = 0 or 255). These are
reserved for special functions and may not be allocated. Therefore, the address
10.0.10.10 may not be used due to the 0 in the second byte.
If a network is to be directly connected to the Internet, only registered,
internationally unique IP addresses allocated by a central registration service
may be used. These are available from InterNIC (International Network
Information Center).
Attention
Direct connection to the Internet should only be performed by an authorized
network administrator and is therefore not described in this manual.
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
Class C: (Net-ID: Byte1 - Byte3, Host-ID: Byte4)
201 .
e.g.:
11000101 00010000
110 Net-ID
The highest bits in Class C networks are always 110.
Meaning the highest byte can be in a range of
110 00000 to 110 11111.
Therefore, the address range of Class C networks in the first byte is always
between 192 and 223.
Address range of the
subnetwork
1.XXX.XXX.XXX -
126.XXX.XXX.XXX
128.000.XXX.XXX -
191.255.XXX.XXX
192.000.000.XXX -
223.255.255.XXX
Network Communication
16 . 232
11101000
Possible number of
networks
127
7
(2 )
Ca. 16 thousand
14
(2 )
Ca. 2 million
21
(2 )
ETHERNET
. 22
00010110
Host-ID
Subscribers per network
Ca. 16 Million
24
(2 )
Ca 65 thousand
16
(2 )
254
8
(2 )
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